/*-
 * Copyright (c) 2013 Marko Zec, University of Zagreb
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id$
 */

#include <stdarg.h>


extern int _xvprintf(char const *, void(*)(int, void *), void *, va_list);

struct snprintf_arg {
	char    *str;
	size_t  remain;
};


static __attribute__((optimize("-Os"))) void
snprintf_pchar(int c, void *arg)
{
	struct snprintf_arg *const info = arg;

	if (info->remain != 1)
		*info->str++ = c;
	if (info->remain >= 2)
		info->remain--;
}


__attribute__((optimize("-Os"))) int
vsnprintf(char *str, size_t size, const char *fmt, va_list ap)
{
	struct snprintf_arg info;
	int retval;

	info.str = str;
	info.remain = size;
	retval = _xvprintf(fmt, snprintf_pchar, &info, ap);
	if (info.remain >= 1)
		*info.str++ = '\0';
	return (retval);
}


__attribute__((optimize("-Os"))) int
sprintf(char *str, const char *fmt, ...)
{
	va_list ap;
	struct snprintf_arg info;
	int retval;
 
	info.str = str;
	info.remain = 0;

	va_start(ap, fmt);
	retval = _xvprintf(fmt, snprintf_pchar, &info, ap);
	va_end(ap);
 
	*info.str = 0;
	return (retval);
}


__attribute__((optimize("-Os"))) int
snprintf(char *str, size_t size, const char *fmt, ...)
{
	va_list ap;
	int retval;
 
	va_start(ap, fmt);
	retval = vsnprintf(str, size, fmt, ap);
	va_end(ap);
	return (retval);
}
